| All Patents in class 91/450 |
Patents 1 -
9
of 9
      |
| Picture | Number | Date | Patentee | Title |
| | 646,458 | Apr. 03, 1900 | H.A. Pedrick | Pneumatic Hoisting Apparatus |
| | 675,528 | Jun. 04, 1901 | R.A. Rutherford | Valve Device for Pneumatic Hoists |
| | 1,613,474 | Jan. 04, 1927 | R. Moore | Brake engine |
| | 2,056,908 | Oct. 06, 1936 | L.L. Schauer | Multiple hydraulic rotor drive for drill spindles |
| | 2,056,909 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit |
| | 2,056,910 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit |
| | 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System |
| | 2,216,800 | Oct. 08, 1940 | W.G. Baldenhofer | Hydraulic Control Device |
| | 2,726,581 | Dec. 13, 1955 | E.G. Roehm | Tracer Controlled Safety Device |
